Inflation valve



FIG. 1 is a front perspective view of an inflation valve showing my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a rear elevation view thereof; and,

FIG. 8 is a front elevation view thereof.

The dashed broken lines in FIGS. 1-8 show unclaimed portions of the inflation valve. 

CLAIM The ornamental design for an inflation valve, as shown and described. 